Symfony\Component\Routing\Exception\MissingMandatoryParametersException: Some mandatory parameters are missing ("node") to generate a URL for route "<current>". in Drupal\Core\Routing\UrlGenerator->doGenerate()

I found this error in my watchdog list:

Symfony\Component\Routing\Exception\MissingMandatoryParametersException: Some mandatory parameters are missing ("node") to generate a URL for route "". in Drupal\Core\Routing\UrlGenerator->doGenerate() (Zeile 180 in /xxx/xxx/xxx/www.xxx.com/core/lib/Drupal/Core/Routing/UrlGenerator.php).

Referrer:http://www.xxx.com/node/index.php

If I call this URL in a webbrowser I get a blank page with this message:

Symfony\Component\HttpKernel\Exception\NotFoundHttpException: No route found for "GET /node/index.php" (from "http://www.xxx.com/de/admin/reports/dblog/event/17642") in Symfony\Component\HttpKernel\EventListener\RouterListener->onKernelRequest() (line 176 of vendor/symfony/http-kernel/EventListener/RouterListener.php).